I just inherited a 1969 Redface Sa-200 and I have a question about how to adjust the low idle. It runs and starts good, threw a tach on it and it is cranking along at about 1500 RPM. Has what looks to be a new solenoid/idler board mounted on it (Weldtron i think) which pulls the idler arm like its supposed to when I activate it manually, but does not idle down. Im guessing previous owner got it up to 1500 at the governor adjustment. I have downloaded all of the manuals for it, but after looking at them am not real clear how/where to adjust it for slow idle?